Climatological and Geographical Characteristics within Inversion Layers in the Presence of High NO2 Concentration |
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| Authors: | Akihiko Naemura Akio Tsuchiya Kaneyuki Nakane |
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| Institution: | 1. Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, 183-8509, Japan
2. Hiroshima University, Higashi-Hiroshima, 739-8521, Japan
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| Abstract: | High concentrations of NO2 may accumulate in the upper regions of the atmospheric inversion layers. In this study, the climatological and geographical characteristics of two cases where a high nighttime NO2 concentration appeared in the inversion layer were studied, one on a slope on the Seto Inland Seacoast and in the Saijo Basin. On the Seto Inland Seacoast, the inversion layer appeared at 160 m a.s.l. There were remarkable differences in the concentration of NO2 and saturation deficit across the boundary of the inversion layer. In Saijo Basin, the inversion layer covered almost the whole basin up to 500 m a.s.l. The cold air lake appearing below 290 m contained an especially high level of humidity and NO2 concentration. In conclusion, it appears that the inversion layer plays a significant role as a cover preventing atmospheric NO2 from diffusing outside the layer. In both cases, it seemed that the water vapor pressure almost reached saturation in the high NO2 concentration zone. |
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